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    <title>Document</title>
    <style>
      * {
        margin: 0;
        padding: 0;
      }

      ul,
      li {
        list-style: none;
      }

      #app {
        margin: auto;
        width: 490px;
        margin: 0 auto;
      }

      #app img {
        width: 100%;
      }
    </style>
  </head>
  <body>
    <!-- images -->
    <ul id="app">
      <li>
        <img
          src="./images/default.png"
          data-src="https://game.gtimg.cn/images/lol/act/img/skin/big1000.jpg"
        />
      </li>
      <li>
        <img
          src="./images/default.png"
          data-src="https://game.gtimg.cn/images/lol/act/img/skin/big1001.jpg"
        />
      </li>
      <li>
        <img
          src="./images/default.png"
          data-src="https://game.gtimg.cn/images/lol/act/img/skin/big1002.jpg"
        />
      </li>
      <li>
        <img
          src="./images/default.png"
          data-src="https://game.gtimg.cn/images/lol/act/img/skin/big1003.jpg"
        />
      </li>
      <li>
        <img
          src="./images/default.png"
          data-src="https://game.gtimg.cn/images/lol/act/img/skin/big1004.jpg"
        />
      </li>
      <li>
        <img
          src="./images/default.png"
          data-src="https://game.gtimg.cn/images/lol/act/img/skin/big1005.jpg"
        />
      </li>
      <li>
        <img
          src="./images/default.png"
          data-src="https://game.gtimg.cn/images/lol/act/img/skin/big1006.jpg"
        />
      </li>
      <li>
        <img
          src="./images/default.png"
          data-src="https://game.gtimg.cn/images/lol/act/img/skin/big1007.jpg"
        />
      </li>
      <li>
        <img
          src="./images/default.png"
          data-src="https://game.gtimg.cn/images/lol/act/img/skin/big1008.jpg"
        />
      </li>
      <li>
        <img
          src="./images/default.png"
          data-src="https://game.gtimg.cn/images/lol/act/img/skin/big1009.jpg"
        />
      </li>
      <li>
        <img
          src="./images/default.png"
          data-src="https://game.gtimg.cn/images/lol/act/img/skin/big2000.jpg"
        />
      </li>
      <li>
        <img
          src="./images/default.png"
          data-src="https://game.gtimg.cn/images/lol/act/img/skin/big2001.jpg"
        />
      </li>
      <li>
        <img
          src="./images/default.png"
          data-src="https://game.gtimg.cn/images/lol/act/img/skin/big2002.jpg"
        />
      </li>
      <li>
        <img
          src="./images/default.png"
          data-src="https://game.gtimg.cn/images/lol/act/img/skin/big2003.jpg"
        />
      </li>
      <li>
        <img
          src="./images/default.png"
          data-src="https://game.gtimg.cn/images/lol/act/img/skin/big2004.jpg"
        />
      </li>
      <li>
        <img
          src="./images/default.png"
          data-src="https://game.gtimg.cn/images/lol/act/img/skin/big2005.jpg"
        />
      </li>
      <li>
        <img
          src="./images/default.png"
          data-src="https://game.gtimg.cn/images/lol/act/img/skin/big2006.jpg"
        />
      </li>
      <li>
        <img
          src="./images/default.png"
          data-src="https://game.gtimg.cn/images/lol/act/img/skin/big3000.jpg"
        />
      </li>
      <li>
        <img
          src="./images/default.png"
          data-src="https://game.gtimg.cn/images/lol/act/img/skin/big3001.jpg"
        />
      </li>
    </ul>

    <!-- javascript -->
    <script src="./js/lazyload.js"></script>
  </body>
</html>
